Question

Va rogggggg plsss dau coroana

Answer 1

Răspuns:

Explicație pas cu pas:

a. a*(b+c) = ab+ac = 2/15+11/75=(2*5+11)/75 = 21/75=7/25

b.c*(b-a) = cb-ca = 19/48-7/36 = (19*3-7*4)/12*3*4 = (57-28)/12*3*4 = 29/144

c. a*b + 2*a*c - a*d <=> a*b+a*c+a*c-a*d = a*(b+c)+a*(c-d) = 5/6*7/20+5/6*/1/24=

=7/24 + 5/6*24 = (7*6+5)/6*24=47/6*24=47/144

Answer 2

Explicație pas cu pas:

a) a•b+a•c=a•(b+c)=2/15+11/75=10/75+11/75=21/75=7/25

b)

b•c-a•c =c•(a-b)=19/48-7/36=57/144-28/144=29/144

c) a•(b+2c-d)=5/6•(7/20+1/24)=5/6•(42/120+5/120)=5/6•47/120=1/6•47/24=47/144